Lao Wang who lives in Beijing wants to go to Shanghai. How much will it cost?

This money is bottomless, and it can be spent very little or a lot. Ways to save money are: Lao Wang takes a train from Beijing to Shanghai, lives in a youth apartment, plays free scenic spots, eats noodles or cheap food every day, and spends at least 100 yuan every day. According to this calculation, he can at least prepare 10K.